I constantly get an ssl_error_rx_record_too_long error message from my Firefox browser when I try to use a https:// link to access a newly created domain. No SSL info has been set for the domain, so it might not have to work. A related post somewhere else describing this problem in the context of Apache configuration What is your opinion? Could ISPConfig avoid this misleading error message by using an SSL capable default page or a similar solution? Falling back to this cryptic error message could cause sleepless hours to less experienced sysadmins trying to find what's going on...
Thats the reson for the error. You will have to create at lesat a temporary ssl certificate when you enable ssl for a site.